DETECTING METHOD OF COLOR SHIFT OF COLOR SEPARATION OPTICAL SYSTEM, AND ITS DETECTING FILM

摘要

PURPOSE:To confirm easily a position shift between each line sensor by moving a color-separated color shift detecting film in a prescribed direction, measuring its transmission light by the line sensor provided at every separated color, and comparing those outputs. CONSTITUTION:A light emitted from a light souce 1 passes through a scanning opening 2, and transmits through a color shift detecting film 3 moved in the direction as indicated with an arrow A. This transmitting light becomes a focusing light by an image forming lens 4, but for instance, only a red component, subsequently only a green component, and the remaining blue component are focused onto a line sensor 7, a line sensor 8, and a line sensor 9, respectively, by dichroic mirrors 5, 6 provided on the way. Subsequently, a position shift of each line sensor is detected by using the detecting film 3 obtained by sticking a strip-like ND filter 11 to developed nonexposure negative 10, and a position shift sensor and a degree of a shift are confirmed easily by a relative density distribution figure of a reproducing picture.